This is the first time in recent memory that the start time has been during daylight hours. Previously, it was midnight PT/3 a.m. ET. And, with presumably more people awake to order, the vendor sites are doing their best to keep up. As of 5:15 a.m. PT, Apple and Verizon were working smoothly for us, while AT&T and Sprint put us into a timed "wait page" for a few minutes. T-Mobile's site didn't yet have a link to complete the order, but offers a phone number you can call.

Overall, the ordering process has been smooth, in contrast to past years when the flood of requests tended to bring down the carrier site. Also, there haven't been many delays, although 256GB iPhone 11 Pro units for various carriers have their arrival date pushed back to as far out as Oct. 11. Sprint's page shows the iPhone 11 Pro Max shipping in October too. Most iPhone 11 and iPhone 11 Pro Max units on Apple's site say they'll ship on time, although some versions of the Max have been pushed back to Oct. 1.

Best Buy

Walmart

Walmart is carrying the iPhone 11 lineup and is offering $50 off each model. The iPhone 11 will be $649, the iPhone 11 Pro $949, and the iPhone 11 Pro Max $1,049. Existing Verizon and AT&T customers can preorder through Walmart's website and have the phone shipped to your home. New and existing Sprint, AT&T and Verizon customers can order online and pick up the phone in store, if you'd rather go that route.

Target

Target has more than just the generic landing page that other retailers are showing. The official pages for the iPhone 11 and iPhone 11 Pro are live, letting you view colors and storage options but you can't order yet. Target typically begins selling new phones on launch day, so in this case Sept. 20.

Sam's Club

US carriers

Verizon

Verizon opened preorders alongside Apple. The iPhone 11 starts at $29.16 per month for 24 months. The iPhone 11 Pro will set you back $41.66 a month, and the iPhone 11 Pro Max will cost $45.83 per month -- both over the course of 24 months. Verizon is giving new customers who switch to the carrier a free iPhone 11, or $700 towards any new iPhone with a trade-in.

T-Mobile

T-Mobile will give new and existing customers up to 50% off an iPhone 11 or iPhone 11 Pro with the trade-in of an iPhone 7 or newer, but you'll need to call to place your order for now. The website isn't accepting orders just yet. You can read the full breakdown of iPhone trade-in values at T-Mobile here.

Sprint

Sprint's preorders are now live, and you can get an iPhone 11 Pro Max for as little as $16.67 a month with an eligible trade-in. There's a lot of fine print on Sprint's promotions, so make sure to double-check requirements before confirming your purchase.

AT&T

Visible

Verizon's prepaid brand Visible will start selling the new iPhones on Sept. 20. Orders will get a $200 Mastercard credit you can then use towards the overall cost of your phone, or to spend wherever you'd like.